The JWs that came to my home in the 1970's were a lot more adept in their "preaching" and actually put some effort into it. My mother converted and I did a few years later. By the mid 1980's no one in the congregation appeared to put any effort into it, myself included. I didn't want a "bible study" with anyone. I had no time. By that time I was also disillusioned with the "love" in the congregation, and didn't really want to inflict that environment on anyone. I didn't want to convince people to dump their "worldly" families and friends in favour of an emotional vacuum.
I deliberately gave shitty presentations at the doors.